﻿//The MIT License

//Copyright (c) 2009 Lluis Sanchez, Nick Darnell

//Permission is hereby granted, free of charge, to any person obtaining a copy
//of this software and associated documentation files (the "Software"), to deal
//in the Software without restriction, including without limitation the rights
//to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//copies of the Software, and to permit persons to whom the Software is
//furnished to do so, subject to the following conditions:

//The above copyright notice and this permission notice shall be included in
//all copies or substantial portions of the Software.

//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//THE SOFTWARE.

using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Reflection;

namespace Polymorph
{
    public static class TypeEx
    {
        public static MethodInfo GetAnyMethod(Type type, String name, BindingFlags flags)
        {
            MethodInfo method = type.GetMethod(name, flags);

            if (method != null)
                return method;

            foreach (Type interfaceType in type.GetInterfaces())
            {
                method = GetAnyMethod(interfaceType, name, flags);

                if (method != null)
                    return method;
            }

            return null;
        }

        public static MethodInfo GetAnyMethod(Type type, String name, BindingFlags flags, Type[] types)
        {
            MethodInfo method = type.GetMethod(name, flags, null, types, null);

            if (method != null)
                return method;

            foreach (Type interfaceType in type.GetInterfaces())
            {
                method = GetAnyMethod(interfaceType, name, flags, types);

                if (method != null)
                    return method;
            }

            return null;
        }

        private static MemberInfo[] GetAnyMembers(Type type, BindingFlags flags)
        {
            Dictionary<MemberInfo, Object> members = new Dictionary<MemberInfo, Object>();
            FindMembersRecursively(type, flags, members);

            MemberInfo[] membersArray = new MemberInfo[members.Keys.Count];
            members.Keys.CopyTo(membersArray, 0);

            return membersArray;
        }

        private static void FindMembersRecursively(Type type, BindingFlags flags, 
            Dictionary<MemberInfo, Object> members)
        {
            MemberInfo[] childMembers = type.GetMembers(flags);

            foreach(MemberInfo member in childMembers)
            {
                if (!members.ContainsKey(member))
                    members.Add(member, null);
            }

            foreach (Type interfaceType in type.GetInterfaces())
            {
                FindMembersRecursively(interfaceType, flags, members);
            }
        }
    }
}